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The structure of silica was studied by diffuse reflectance infrared spectrum, and the two-dimensional diffuse reflectance infrared spectrum was further studied with Si-O-Si asymmetric stretching vibration (v asSi-O-Si) and Si-O-Si symmetric stretching vibration (v sSi-O-si) of silica as objects. The infrared absorption peaks of silica are V asSi-O-Si-1-2D (including Vas Si-O-Si-l-A-2D/ 1175 cm-1, and V asSi-O-Si-l·B-2D/1171 cm-1), V asSi-O-Si-2-2D (including V asSi-O-Si-2-A-2D/1092 cm-1, V asSi-O-Si-2-B-2D/1088 cm-1 and V asSi-O-Si-2-C-2D/ 1086 cm-1), V s Si-O-Si-1-2D (including Vs si-O-Si-l-A-2D/ 812 cm-1, Vssi-O-Si-l-B-2D/806 cm-1, Vssi-O-Si-l-C-2D/802 cm-1, Vssi-O-Si-l·D-2D/ 796 cm-1 and V s Si-O-Si-l-E-2D/ 792 cm-1), V s Si-O-Si-2-2D (including V s Si-O-Si-2-A·2D/ 788 cm-1, V s Si-O-Si-2-B-2D/ 784 cm-1, V s Si-O-Si-2-C-2D/ 778 cm-1, V s Si-O-Si-2-D-2D/774 cm-1), V s Si-O-Si-3-2D (including V s Si-O-Si-3-A-2D/700 cm-1, V s Si-O-Si-3-B-2D/ 696 cm-1, V s Si-O·-Si·-3-C-2D/692 cm-1 and V s Si-O-Si-3-D-2D/ 682 cm-1), V s Si-O-Si-4-2D/ 518 cm-1 and V s Si-O-Si-S-2D (including v s Si-O-Si-S-A-2D/ 475 cm-1 and v sSi-O-Si-s-B-2D 465 cm-1). Under the time disturbance factor, the order of change speed of each absorption peak is 1175 cm-1 > 1171 cm-1 1086 cm-1 > 1088 cm-1> 1092 cm-1, 802 cm-1 > 812 cm-1 > 792 cm-1 > 806 cm-1 >796 cm-1,774 cm-1 >788 cm-1 > 784 cm-1 > 778 cm-1, 682 cm-1 > 696 cm-1 >700 cm-1 >692 cm-1,465 cm-1 > 475 cm-1. [ABSTRACT FROM AUTHOR]

Intrusion detection system (IDS) is an important instrument in the domain of information security. In the information security course, "intrusion detection" is very important part with its contents having many concepts and the principle being abstract. In order to consolidate student's theoretic knowledge and improve their practical abilities and innovation consciousness, the experimental teaching of IDS is explored. On the basis of analysis of the framework and structure of Snort, the experiment scheme of network IDS is designed, which is base on Snort and fits for the standard of common intrusion detection theory. By analyzing and presenting the framework and structure of Snort, the experiment scheme of network IDS is designed based on Snort, and fits for the standard of common intrusion detection theory. The experimental environment of IDS is built in the laboratory network, the key steps of deploying the system are detailed, and test results of intrusion detection experiments are analyzed. The practical research finds that the student can be inspired to study with interest and enthusiasm, widen the range of knowledge, improve synthetic ability and trained innovation consciousness through the research type experiment of digital filter design. The practical research finds that IDS experiment teaching is helpful to inspiring students ' learning motivation and enthusiasm, deepening their understanding of abstract knowledge, widening their range of knowledge and improving the teaching quality of information security course. [ABSTRACT FROM AUTHOR]

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